ECPKPARAMETERS_PRINT(3ossl)

📦
version 15.1 · 3 versions
, in freebsd 15.1

💅 ECPKPARAMETERS_PRINT — the OpenSSL one (3ossl) ✨

okay bestie, so this page is about ECPKParameters_print and ECPKParameters_print_fp — literally the functions for decoding and encoding ASN1 representations of elliptic curve entities 🦋. Yes, that's the whole NAME section, and yes, the 3ossl bit just means it lives in the OpenSSL manual, section 3. Keep up, you're doing great 💖

🚨 heads up before literally anything else: all of the functions on this page are deprecated. Like, fully. Do not start a new project with them, iykyk.

✨ SYNOPSIS ✨

#include <openssl/ec.h>

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value — go peek at openssl_user_macros(7) for the deets 🎀:

int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);

🌸 DESCRIPTION 🌸

okay so first thing's first, and I'm gonna say it louder for the people in the back: all of the functions described on this page are deprecated 💀. Applications should instead use EVP_PKEY_print_params(3). That's the main character now. Periodt.

Right, so the ECPKParameters represent the public parameters for an EC_GROUP structure, which represents a curve 🌈. (Yes, the curve. The whole vibe. The math.)

Then we've got the two besties:

  • ECPKParameters_print() — prints a human-readable output of the public parameters of the EC_GROUP to bp. The output lines are indented by off spaces 💅
  • ECPKParameters_print_fp() — same exact energy, except it prints to fp instead. The output lines are indented by off spaces 💅

So like, off is literally just how many spaces you want in front of every line. Cute little formatting knob. Slay.

🫶 RETURN VALUES 🫶

  • ECPKParameters_print() and ECPKParameters_print_fp() return 1 for success 🎉
  • and 0 if an error occurs 😭

that's it. that's the whole thing. no in-between, no "it's complicated". 1 or 0, iconic behaviour honestly 👑

🦋 SEE ALSO 🦋

(and yeah, the original list does end on a comma, no I will not be fixing it, it's part of the charm 🙈)

⭐ HISTORY ⭐

All of these functions were deprecated in OpenSSL 3.0. That's the whole history section. Short, sweet, devastating 💀

Copyright 2013-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

and that's the page, bestie 🧚💜 this was manual page ECPKPARAMETERS_PRINT(3ossl) from OpenSSL 3.5.6, dated 2026-04-07 — go use EVP_PKEY_print_params(3) instead, ily, bye 💖🎀

📦 where this page comes from